Final answer:
The specific year when the technical ranks of CPL, SGT, and SSG were re-established as "Specialists" is not found in the provided references. However, historical records indicate that the Specialist rank was introduced in 1955 during the U.S. Army's reorganization.
Step-by-step explanation:
The technical ranks in the grades of CPL (Corporal), SGT (Sergeant), and SSG (Staff Sergeant) were re-established as "Specialists" in the context of reorganizing the military, which was part of broader changes during the early Cold War period. Although the provided references focus on the racial integration of the US military, the specialized training units like Ranger companies, and the shift in military tactics during the Korean War, they do not offer a specific year when the technical ranks were reclassified as "Specialists." Based on historical records from the U.S. Army, the rank of Specialist was introduced in 1955, following the reorganization of the Army's enlisted rank structure.